I have a sequence of file names and I want to make them unique. (uniquify
["a" "b" "c" "a"]) => ["a" "b" "c" "a_1"])
This is what I have come up with, but surely there is a better way?
What would you all do? Feedback welcome (including the word 'muppet' as I
am sure I have missed something simple) :)
(defn uniquify
"Return a sequence, in the same order as s containing every element
of s. If s (which is presumed to be a string) occurs more than once
then every subsequent occurrence will be made unique.
Items will be updated to include an incrementing numeric count using
the specified formatter function. The formatter function will be
given the name and the number and should return a combination of the
two.
The set of unique s's in the returned sequence will be the count of
s's in s."
([s] (uniquify s (fn [item duplicates] (str item "_" duplicates))))
([s formatter]
(let [occurrences (atom {})
register-occurrence (fn [item]
(if (get @occurrences item)
(swap! (get @occurrences item) inc)
(swap! occurrences assoc item (atom 1)))
@(get @occurrences item))
process (fn [item]
(let [duplicates (dec (register-occurrence item))]
(if (> duplicates 0)
(formatter item duplicates)
item)))
unique-s (map process s)]
unique-s)))
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